Safety and immunogenicity of a seasonal trivalent inactivated split influenza vaccine: a double blind, phase III randomized clinical trial in healthy Serbian adults by Goran Stevanovic, Aleksandar Obradovic, Snezana Ristic, Dragan Petrovic, Branislava Milenkovic, Danilo Mitrovic, Svetlana Filipovic Vignjevic, Katarina Ilic, Vera Stoiljkovic, Lidija Lavadinovic, Mijomir Pelemis, Svetlana Petrovic, Ana Vidmanic, Olga Popovic, Natasa Eremic, Erin Sparrow, Guido Torelli, Muriel Socquet, Renée Holt, Yordanka Ilieva-Borisova, Yuxiao Tang, Francesco Berlanda Scorza, Jorge Flores, Niraj Rathi